gistfile1.txt

def f():
    future = asyncio.Future()
    future.set_result(5)
    return future # yield from f() returns 5.

def g():
    future = asyncio.Future()
    asyncio.get_event_loop.call_later(1, future.set_result, 5)
    return future # yield from g() also returns 5 but 1 second later